Exercise mat



FIG. 1 is a front perspective view of an exercise mat according to my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are for the purpose of illustrating environmental structure and form no part of the claimed design. The dot-dash lines are boundary lines and form no part of the claimed design. 

CLAIM The ornamental design for an exercise mat, as shown and described. 